[meta] fix scripts to use prepublishOnly

Author: ljharb

package.json

@@ -29,7 +29,8 @@
     "get-version": "node -e \"console.log(require('./package.json').version)\"",
     "update-readme": "sed -i.bak 's/\\/master\\.svg/\\/v'$(npm --silent run get-version)'.svg/g' README.md",
     "restore-readme": "mv README.md.bak README.md",
-    "prepublish": "in-publish && npm run update-readme || not-in-publish",
+    "prepublish": "not-in-publish || npm run prepublishOnly",
+    "prepublishOnly": "npm run update-readme",
     "postpublish": "npm run restore-readme"
   },
   "pre-commit": [